Q: A 4-m-high and 6-m-long
A 4-m-high and 6-m-long wall is constructed of two large 0.8-cm-thick steel plates (k = 15 W/mâ‹…K) separated by 1-cm thick and 22-cm-wide steel bars placed 99 cm apart. The remaining...
See AnswerQ: A typical section of a building wall is shown in Fig.
A typical section of a building wall is shown in Fig. P17–132. This section extends in and out of the page and is repeated in the vertical direction. The wall support members are mad...
See AnswerQ: A 12-cm-long bar with a square cross section
A 12-cm-long bar with a square cross section, as shown in Fig. P17–133, consists of a 1-cm-thick copper layer (k = 380W/m⋅K) and a 1-cm-thick epoxy composite layer...
See AnswerQ: Circular fins of uniform cross section, with diameter of 10 mm
Circular fins of uniform cross section, with diameter of 10 mm and length of 50 mm, are attached to a wall with surface temperature of 350°C. The fins are made of material with thermal cond...
See AnswerQ: A total of 10 rectangular aluminum fins (k = 203 W
A total of 10 rectangular aluminum fins (k = 203 W/m⋅K) are placed on the outside flat surface of an electronic device. Each fin is 100 mm wide, 20 mm high, and 4 mm thick. The fins are located parall...
See AnswerQ: A plane wall with surface temperature of 300°C is attached
A plane wall with surface temperature of 300°C is attached with straight aluminum triangular fins (k = 236 W/m⋅K). The fins are exposed to an ambient air condition of 25&A...
See AnswerQ: A plane wall surface at 200°C is to be cooled
A plane wall surface at 200°C is to be cooled with aluminum pin fins of parabolic profile with blunt tips. Each fin has a length of 25 mm and a base diameter of 4 mm. The fins are exposed to ambient a...
See AnswerQ: A room is cooled by circulating chilled water through a heat exchanger
A room is cooled by circulating chilled water through a heat exchanger located in the room. The air is circulated through the heat exchanger by a 0.25-hp (shaft output) fan. Typical efficiency of smal...
See AnswerQ: Steam in a heating system flows through tubes whose outer diameter is
Steam in a heating system flows through tubes whose outer diameter is 3 cm and whose walls are maintained at a temperature of 120°C. Circular aluminum alloy fins (k = 180 W/mâ‹&#...
See AnswerQ: A 0.2-cm-thick, 10-cm
A 0.2-cm-thick, 10-cm-high, and 15-cm-long circuit board houses electronic components on one side that dissipate a total of 15 W of heat uniformly. The board is impregnated with conducting metal filli...
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